Metal-working machine



July 29 Filed Feb. 20. 1923 4 Sheets-Sheet 1 July 29, 1 24. 1,503,111

R. 5. BROWN METAL WORKING MACHINE Filed, Feb. 20. 1923 4 Sheets-Sheet 2 July 29. 1924.,

R. S. BROWN METAL WORKING MACHINE 4 Sfieets-Sheet 3 Filed Feb. 20. 1923 PatentedJuly 29, 1924.

ROBERT s. BROWN, or New BRITAIN, oomvnorrour, Assrenon TO THE NEW BRITAIN MACHINE COMPANY, or new BRITAIN, oonnnorrour, A coaroaerrron or coN- NEOTIGU'T.

IVIETAL-WORKING MACHINE.

Application filed February 20, 1923. Serial no. 620,210.

To all whom it may concern:

Be it known that ROBERT S. BROWN, citi zen of the United States, residing at New Brltain, in the county of Hartford and State of Connecticut, has invented certain new and useful Improvements in Metal- Working Machines, of which the following 1s a specification.

This invention relates to metal-working 1 machines, and in that form of embodiment of the invention which I have selected for illustration in the drawings accompanying and forming part of the present specification, the machine takes the form of an automatic screw machine, the improvement being particularly in means for chucking irregular work in a moving spindle.

Among the objects of the invention are the provision in a machine of the character set forth, of means by which work of irregular character such as nut-blanks can be chucked into a moving spindle. What is illustrated in the drawin 's will be set forth fully in the following escription so that those skilled in the art can practice the invention. However, I- am not restricted .to such disclosure. I may depart therefrom in a number of respects within the scope of the invention defined by the claims followingsaid description;

In Letters Patent No. 1,177,827 issued April 4, 1916, to Christopher M. Spencer, and assigned to The New Britain Machine Company, is shown a machine of the general type in which the present invention is incorporated and in Fig. 1 of the annexed drawings, I have shown more or less fully, such a machine. v

It will be noted that while primarily my improvements are especially adapted for in-.

corporation in machines of this general type- I am in 'no sense, however, restricted thereto.

Referring to said drawings: 7 Figure 1 is aside elevation of a metal working machine involving, the invention.

Fig. 2 is aside view on a somewhat larger scale of work-positioning means, several work-spindles and tool-spindles being shown.

1 Fig. 3 is a-sectional endelevation as seen for example from the right in Fig. 2.

' Fig. 4 is a vertical section'on the line 4-4 of Fig.3, looking in the direction of the arrows. Y

Fig. 5 is a section virtually like Fig. 4: but with the work-holding spindle moved backward or in its initial position.

Fig. G is a practically similar View to Fig. 4 but showing the work-holding spindle in a second stage or, its operation or showing the work as having been thrust into aworkholding spindle.

' Fig. 7 is a cross section on the line 7-7 of Fig. 3,. looking in the direction of the arrows.

Fig. 8 is a cross of Fig. 4, looking arrows. V

Fig. 9 is a cross section on the line 9-9 of Fig. 4, looking in the direction of the arrows.

Fig. 10 is a cross section on the line 10-10 of Fig. 4 looking in th directionof the arrows.

section on the line 8-8 Fig. 11 is a cross section on the line 1111 of Fig. 6. looking in the direction of the arrows.

Like characters refer to like parts throughout the several 'views.

7 Referring first to Figure 1. I have shown in side elevation a somewhat complet illustration of a metal working machine which as represented. is in the form of an automatic screw machine, so-called. Such a.

screw machine involves a frame-work such as that denoted in a general way by2 and which asshown COI'XIIJIlSBS'flbase or bed 3,

which has bolted or otherwise fastened to its upper side, a standardas 1,the standard as shown comprising several uprights as 5 which sustain the main shaft 6 which runs lengthwise of the machine or of the frame work 2. The two uprights 5 at the leftare connected at'their top by a' table 7 which carries aworlehead such as 8. This Workhead 8 is rotative and as shown it-sustains several' work-spindles as 9. It shpuldbe noted at this point that the head- 8.1s given an intermittent or step by-step rotation and that the work-spindles 9 supported thereby, are given a rotation. During this rotation of.

.the work-spindles, work'is introduced into collets or work carriers at the forward or inner ends thereof and as th head turns,

the spindles carrying the work, position the in the direction of the work, so that it can be acted on by tools, practically in the manner set forth n the Spencerpa tent which I have already identi- The invention particularly resides in the positioning of work of irregular formation inclioss section which has heretofore been diflicult to position. By the present machine, however, I can position this work I while the machine is in normal running acof vwhichhas a conical seat 18. to receive for sliding movement the jaws l4which are intendedto receive work of irregular form in crio ss section. "The work strikes theplunger 15 which extends into the jaws 14 and which p'rojectsifrom a tube i16which is attached by a pin=as 17 to each bar or rod near the forward end thereof as represented in ig. 4". The -plunger*15 has. on it a shoulder 18 whichslides in the tube 16. The rear end portion of the plunger is surrounded by a coiledspring as 19-bearing at its front end againstthe-shoulder 18 and at its rear end against the front end of the rod '10, as clearly shown Fig. 4. e i

WVhen a piece ofwork, such for instance as a nut blank, is introduced between the jaws 14, the work strikes the front end of P the plunger 15 which thrusts theplunger rearwardlyor toward the left in Fig. 4 and slightly compresses the spring 19 so that when the jaws 14 are afterwards opened thereaeting spring caneject the work from the'jaws 1 4. It-might be explained 'at this point that-the work ordinarilyof polygonal form in' cro'ss section is thrust between the jaws 14=an1dagainst the front end of the plunger 15 after"which'thejaws '14 are closed upon -the work, the head'12 asit rotates, bringin the work a-roundto position WllBIB-lt can eacted uponby the tools of the toolspindles. I i

"It willprobablybe understood from 1 foregoing descriptionthatthehead Sis rotatedintermittently or step by step, and

during such action the workespinddes are being-rotated and duringthe rotation of the ssplndles the work is introduced thereinto aswill be hereinafter explained, and

at a+proper point. this work is subjected to the .actionofftools such as 20: and 21 carried atithe -for ward endsfof the tool spindles as 22 supporte'dfby' the carrier as 23, see Figs.

=' 1.:and '2. The work isintroduced practically automatically gin-to the jaws 14 and .the'

means by which it is possible will be hereinafter set forth. The head 8 then rotates so that the work can be brought .under the action of the tools 20, 21, etc, after which the work is automatically ejected in a fin ished state from the jaws 14.

There is coaxial with each work spindle, when it comes to a state of rest at the bottom, as shown for instance in Figs. 1 and 2, a spindle as 24, and which is given an endwise movement so as to feed the work carried thereby between the jaws 14 at the front end of the work-spindle, the spindle 24 having work-holding meanssuch as shown by rigs. 2, 4 and 6. The spindle 24 incloses as shown in Fig. 6 anendwise movable rod 25. Said spindle 24v at its forward end on the left side as shown. in Figs. 5 and 6 extends into a casing or guard 26, theouter wall of which has an opening '27 through which the head 28 of the=spindle 24 is exten sible in either direction, toward the left, its

advancemovementin Fig. 6, or toward the right, its retractive movement in Fig. 5. The head :28 supports the gripping levers 29. As shown, these gripping levers 29 have upon their inner sides-complemental arms 30 which are pivoted at their inner'ends asat- 31 to the head28, the arms 30 back of their pivot being slotted as at 32 -to receive the guide pins 33 as shown in said Figs. 6 and 8. The forward ends of the gripping levers 29 are opened by hand as I will hereinafter set forth at which point a blankis inserted also by hand between the opened jaws of the levers which close when'the levers are freed so that the levers are caused to grip the blank to introduce it into the jaws 14 as shown for instance by'Fig. 4.

To rotatethe work-carrying spindles, and the work-introducing spindles 24' in unison,

the following mechanism maybe utilized.

Upon the work-spindle, as shown, in 4. is attached a gear wheel'34 which-can-be rigidly clamped thereon in any suitable manner. The peripheral teeth of the gear 34 are in mesh with the peripheral teeth of a gear I should be remembered that the action of the friction bevel discs 35 and 44 :4)

will be to bring the work from a state of rest without shock to initial rotative speed faster than that of-the work-spindle 12. By forward movement of the handle 40, the friction discs are moved outof contact with each other so that the speed of the spindle 24' will be picked up by the pawl and will be rotated exactly in speed with the spindle '12. It will be understood that the contour of the piece to be tapped may register in only one position with thespindle and yet be properly inserted. It will also be probably understoodthat when the friction discs are in contact the spindle will rotate at ahigh speed somewhat faster than 36 fastened to the shaft 37. "It

iii

are in contact, the spindle has a tendency to lag, its speed of rotation being picked up,

however, by the-pawl 46'so' that it will rotalte exactly at the spindle speed.

There is rotative with said shaft 37 the spur gear 38 as learly show'n'in Fig.4. As

represented, sai spur gear 38 is fastened to a friction disk as 35, the hub of which is splined to the shaft 37. In mesh with the gear 38 is the gear 39 inclosed by. the guard 26. This spur gear is carried by the spindle 24 and when the parts are in normal condition, it is free to rotate upon the spindle. WVhen the spindle 24 is moved toward a work-spindle, a certain distance, the gear 39, is by mechanism associated with the spindle 24, caused to rotate as will be hereinafter set forth. In the position shown in Fig. 4, the spindle 24 is at rest while the spur gear 39 is rotating upon the same. Upon a diagonally extending shaft as 39' supported by the member 23 of the machine is fastened at the upper end thereof the handle 40 for turning said shaft. The pinion gear 41 is fastened to the lower end of said shaft and is in mesh with the teeth of the rack 42 upon the sleeve 43. Vhen the shaft 39' is turned by the hand lever 40 connected therewith, the gear 41 will be rotated so as to move the rack 42 rearwardly. This rearward movement of the rack 42 causes the friction disk 44 to be brought into contact with the friction disk 35. This owing to the difference in diameters will cause the spindle 24 to rotate faster than the work spindle. When this is accomplished, the rotating spindle 24 is moved forward or toward the work-spindle as by the hand lever 40. Upon the front of the gear 39, and which, of course, rotates with the gear 39, is pivotall Y mounted a pawl or dog 46 which is helci at its point or tooth against the exterior of the sleeve 45 as by the spring 44. When the gear 39 rotates, the pawl .46 revolves around the sleeve or hollow shaft .45. Said sleeve or hollow shaft 45 has in it the key-way 47. When the shaft 45 is moved forward or advanced, the point or tooth of the pawl 46 is thrust into the key-way 47 as shown in Fig. 11,.by the spring 44 whereby the revolving pawl will now rotate the hollow shaft 45 so that if a blank 48 be introduced between the levers 29, it will be thrust between the jaws 14 of the work-spindle and against the spring -actuated bar 15, the workholder 24 at this time rotating at the same speed and in exact registry with the irregular opening in the jaws 14' which correspond of course with the blank'48. When the work-holder 24 has advanced to a point where the blank is entering the jaws, the encircling collar- 49 comes in contact'w'ith the washer 50 on the real end ofthe rod 25 and holding the said rod from any further advance. A continued advance of the work-holder or spindle 24, however, will cause the fingers 29 to move out of holding engagement with the blank as can clearly be seen by referring to Fig. 6.

Although the action of the machine will undoubtedly be readily understood, it may not be amiss to refer briefly to thesame.

Initially with-the parts in theposition shown in Fig. 1 the drum or.--'work-carrier 8 and the spindle'24 are assumed to he at rest When the parts are in this relation, a piece of work will be introduced between the work-holding parts of the levers 29, the

hollow shaft 24at this time being back, as

shown in Fig. 5, for instance. The handle 40 is now grasped and turned backwardly,

thus rotating the shaft 39 and the pinion 41 so as to draw back the rack 42 and thus carry the friction clutch member 44 against the friction clutch member 45, and cause the rotation of the shaft 24. The handle 40 is then moved oppositely, thus advancing the shaft 25 or moving it toward the left in Figs. 5 and 7 under the action of the pinion 41 and thus carrying the disk or clutch member 44 out of, contact with the disk or clutch member 45, with a piece of work between the levers 29.. The pawl 46 is being revolved by reason of its being carried by the clutch member 44. During the normal -which action the shaft 24 is being rotated by the pawl 46. Upon drawing the hollow shaft 44 backwardly, the conditions are exactly reversed.

In the annexed drawings, and in the foregoing description; I have disclosed quite fully a construction involving my invention. In no sense, am I restricted to the disclosure made thereby, as the invention involves certain'broad relations as will be set forth in my claims. r

What I claim is:

1. The combination of a rotary spindle,

having a work-holder. of a second'spindle having work-carrying means, driving and driven discs, the driving discs being constantly rotative, means to present work to the work-carrying means, means for endwise moving the second spindle to present the work carried thereby to the work-holder and me ns for driv ng the second Spindle at a speed-approximately "agreeing with that off the rotary spindle at the time the Work carried by the rotary spindle is presented to the Work-holder. I

.2. The combination of a rotary spindle, having a WOfik hOidGIQ'Of a second spindle having "Work'ec'alrrying means, means for causing an advance :and 5a retracti-ve-m'ovement of the second spindle, the WiOJZk-IIH-I 'BY- in-g means on the advance movement presenting-Work .from A the "'work-carnyhig means -to the wonkholder, means for ieflecting ithe rotation offthe second spindle initiilly at 'a mpidespeed with ,reepeet to the lfii'rillfy spindle aindutheneaiterin exact gspeed of thesizo- 15 tery spindle, end means for :throWi-n; out of action the :second (spindle ibyfwhic 115118 exact rotation of :the rotary spindle with respect to the second spindle is efiected.

In testimony whereof .I hereby iaffix my 20 

